Which of Newton's laws best explains why motorsg:u x .qtuq-fdjzncs7l6124ists should buckle-up?

  When you sit on a chair, the resultant fuhkyo;zcfne/ ;7b6ooujt v34nn wv: /,, z za8orce on you is

  In the absence of an external force,/iwnv5xx;j +z a moving object will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenly tubo4yhjj / mo9;8tb1 m(1u v,s6pwrizlrned off, while traveling in empjpmuosz,61rt; (j 9bivy m1bhw84/ o lty space, the starship will

  A rocket moves through empty space in a straight line with constant speed. Ij0hv,bu w): apt is far from the gravi jh v)ba0uw:p,tational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in aisuo*1yoeg+ l2l1 oj) moving bus, facing forward, and you suddenly fall forward. You y*1sj)o ll+ui1oge2ocan imply from this that the bus's

  You are standing in k/y:men.g9rvn5h2 n kv/h -c ka moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate 9/5vknhmvk. 2 n/egkr:- c hnystop. What force caused you to fall forward?

  A constant net force acts on an object. vc 1sl-b,fxx, Describe the motion of the object.

  The acceleration of an object is inve/yk1nfhi ipjo,4n1w )hq ,f2zrsely proportional to

  A net force F accelerates a pf5g .w ; )tu5qp hne1 u*tzg.hdhf4n+*uxd .emass m with an acceleration a. If the same net force is applied to mass 2m, then the acceleration will ehwf;p.th5ug .ed)n1zh*qpx u 4t*fn.+5 du gbe

  A net force F acts on a mass m and produces an acceleration a. Wha 8s 6qugvkqp7 ruppowy--48 0pt acceleration results if a nepu 7qs8qrk8- w 0v4p6ou gp-pyt force 2F acts on mass 4m?

  If you blow up a balloon, and t u:a6s(wkk2z2e8 p wrvhen release it, the balloon will fly away. This is an ikz 2:2 krwwaups8ve6 (llustration of

  Two cars collide head-on. At every momibfp5,q x;udn*7e) fment during the collision, the magnitude of the force the first car exerts on the second is exactly equal,qfmu)fp;e7inxd 5 * b to the magnitude of the force the second car exerts on the first. This is an example of

  If you exert a force F on an obje- eva*v1u w3ch-, jvefqu k*1nct, the force which the object exerts on you wi ,kahenjvu- 1 3w*fv*e -c1uvqll

  Action-reaction forcw l4lpmq,5monep2 6 a7*eg/p xes

  Action-reaction forces ahw k*6 uy,va ;2zdesu,re

  A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the clc7mk;c8 7xuw,;ao wjar. k,;ju 7w7la8xccm w;oSince a lot of damage is done on the car

  An object of mass m sits xzi,w1ej :awl)a36 hron a flat table. The Earth pulls on this object with force mg:3wie6l), h ar jx1zwa, which we will call the action force. What is the reaction force?

  A child's toy is suspended from the ceiling by means s )pwitm6rk(y/ /vwb0e8f neh*iu e:j.qo 6i6of a string. The Earth pulls downward on the toy with its weight force of 8.0 N. If this is the "action force//(*sw6 ki)tqhmj .rnieuf vw68 biep0e6y:o ," what is the "reaction force"?

  Your bat hits the ball pitched to you with a 1500s/+x nqdh wllw1*5x6b -N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude iw* n1 sw+xhldx5l /6bqs

State Newton's three laws.+eovwn 9b:r q;c7 -gbe

  Mass and weight

  The acceleration due tol sz ukt5;m,v* gravity is lower on the Moon than on Earth. Which of the followin t;s*mlvuk5z, g is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

  An example of a force which acts at a+v w ox0;dv61psqs fc;aas2.y distance is

  Who has a greater weight lssg rq);z60sc* 3 +p/ig-ohcmy0v pjto mass ratio, a person weighing 400 N or a person weighing 600 3iz 06smp*g -/y+ospqcjsg );v0lrch N?

  A stone is thrown straight up. At the top of its path, the net force acting onsb* ce9fscxnw2ev g,z 9*3aghd8x,* k x b3*2wdgenkf9 ,*8a,sz s *ec gxvh9cit is

  A 20-N weight and a 5.0-N weight are dropper km/4(3hm4 .(:zlcdya az kqkd simultaneously from the same height. Ignore air resistance. C y rdmkmq/( k4:z4zlh3 .caka(ompare their accelerations.

  A brick and a feather fall to the earth at their respective terp42vap f td nz z*gdz2)*;cr+vminal velocities. Which obj2 d)v+zp par;d nv4*z *ft2gzcect experiences the greater force of air friction?

  An object of mass m is hanging by a string from the ceiling of an 0jez2m: cld3qelevator. The elevator is moving up at j0l3z ecd2 q:mconstant speed. What is the tension in the string?

  An object of mass m is hanging by a str wler;4( s+kjfg+9 nwqing from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is the tensio lnjk+g wf(;w4 r+9qesn in the string?

  The force that keeps you ,b g57wfv4dl vxrdw*9qs( i.k from sliding on an icy sidewalk is

  It's more difficult tw pa v)0blmx1kx7( ;wh znyj-rur(3r8o start moving a heavy carton from rest than it is to keep pushing it pvuwx1 3( ;ybakr-mw7zrl (hj0)rx8n with constant velocity, because

  A horizontal force accelerates a box from restyqmqsgsit8;2e*9 s fy. 6+bxc across a horizontal surface (friction is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the excepts; s2q8y+sbfyemcgi* 6.9x qtion that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp at constant velocity. Thus wbphv:hy9fo;8 z1f,i u.()v.znc b ppbe can deduce thahf.;.1cbvohz8,p zify b)p 9bu p v(n:t

  A block of mass M slides down a frictionless plane inclined at an angle q wit44k5mg6h.tg/ x)wfyo cewek2 h the horizontal. The normal reaction force exerted by the plane on the.g6/gxotc ehmk ewy5 k2)44wf block is

  A block of mass M slides *s (9iqw+h drxq7)9tu;a r czhdown a frictionless plane inclined at an angle q with the horizontal.9aq7sdhqhc9;rr t* zi+x)u (w The normal reaction force exerted by the plane on the block is directed

  A block of mass M slides down a friction p.e)/8or/ek nz:dlfs less plane inclined at an angle q with the horizontal. The gravitational force is po/de rl/e szf)8:n .kdirected

  Two toy cars (16 kg and 2.0 kg) 1flyqz0:wns0rw 8a k6 are released simultaneously on an inclined plane that makes an angle of 30e with the horizontal. Make a statement which best describes their ak01s wa:60lw r nq8yfzcceleration after being released.

  An object sits on a frictionless surface. A 16-N forcxqs31.tv)e5q mpyc*a6cp- 0d,err xbe is applied to the object, and it acct03 rp61,qpc.)*xrq d5mbv a-s eyx ecelerates at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate frcd7 x +8 knem:m)wk2-ouet a9com rest to 27 m/s in 7.0 s. What is the average forwaca cx 9kt )ow78mnu2-m+eekd :rd force on the car?

  Starting from rest, a 4.0-k/rkgt6d m jj ,q-cg 8ptg:ge36g body reaches a speed of 8.0 m/s in 2.0 s. What is the net fo:jttg8g3pmgj dq, - k66 r/egcrce acting on the body?

  An antitank weapon fires a 3.00-kg rocket which acqui0 aika q62:x+n4lxj eires a speed of 50.0 m/s after traxkja0 i4x2il+a qen6:veling
90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

  If you push a 4.0-kg mass with the sa 71- ek-0ctqdbova w8cjhj1755tk fikme force that you push a 10-kg mass from resae i807v bjt5kk - 1qhj5dc-wo17t fkct,

  What is the mass of a person who wefrsoaaf r/7 tt; /;:jfighs 110 lb?

  What is the mass of an object that weighs 250 N onga k wy41luz.h/r3-hp the surface of the Earth where the acceleration due to gravh1w h -uy/r43lkga zp.ity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on t60x;rn nwm 6kwhe Earth. What is the mass of the object on the surface of the Moon where the ac6;xwm r n6wk0nceleration due to gravity is only 1/6 of that on the Earth?

  Object A weighs 40 N on Earth, and object B weighs 40 Nw 73tf/7dhbcue 5i2e y on the Moon. The Moon's gravity is one sixth of Earth's. Comewf27 tcy d7/3 heiub5pare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on oppositpc,x0 8c;ejju- xlnn7(a vfln u7l39+tm4kkte ends of a 5.0-kg rope. Sue pulls with a 15-N force. Whatnn 3mcktkce4-xu n,ll t pfx0j+lj8a7(;v9 u7 is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F a/r5anidk r,ms0 iz9au 3y -io;cts on the stack, and i;o/5n ikmi093 aryds,-u arizt accelerates at $3.0 \; m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0 \; m/s^2$. What was the mass of the original stack?

  A person of weight 480 N stands on a -yxus 5py)myso2 -q2.0v jsy4wt q3jyscale in an elevator. What will the scale be reading when the w54ys2 x-jqj ss0y vyq mu )y.ypo-t32elevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass o+d.g vjlj ax+y5,wpt )5*yti rf the person is 60.0 kg and the elevator accelerates downward with an accj*p tr5 yait5x+j+ylv ), dg.weleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides in an elevator. If the mass of7s)pfsyfc jb4)og (.mq0m y q8 the person is 60.0 kg a) f7pjms s04 ymgfc(qby o)8q.nd the elevator accelerates upward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One force has ai/vr osfb5 .avy) .pt8 magnitude of 8.0 N and is directed due north. The second force toward )py. ao.tr5bfvv/ is 8the east has a magnitude of 6.0 N. What is the acceleration of the mass?

  An object of mass 6000 kg rests on bqx0 ktg6( k7gthe flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum g06kg7xbt(q k stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on +q xi thkn5fzy8 ,4u3dthe flatbed of a truck. It is held in place by metal brackets that can exert a i3tufq 5 kxz4h,yn8+ dmaximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kia4 oz dslad2)-ox e**g and m = 0.40 kg, what is the magnitude of the acceleration of th ixddlo*e*s)2a4o a -ze system? (Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, zmp 2 mvyqu7bz85 r2c*what is the tension in the string? (Ic58y7vp2mr*zzm b q 2ugnore friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal floor with a fo,rt17u9 2vfkuouaer 9t5 fv0n rce of 100 N in a direction o1 ef0au792kvtn,r59u t r fuvof $37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

  A student pulls a bofj-62k )-6ai oa ncjz pr a7p05hlt7fqx of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the box and the books isf)-o 0akr76azjlj 2f q5pnciap6 h 7t- 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N is supported by to1jt47 -i k1p0*fdkzf 9ul snyfcy-5 mwo ropes as shown in Fig. 4-2. y9t*5-zmu f kyc lofs- fdi1 jpnk4071 What are the tensions in the ropes?

  In Fig. 4-2, if the tensions in the ropes are ) 6vzr.x)y*1 h zakzts50 N, what is the mass of the traffi .z1xrv*hy)z s6 t)zakc light?

  Two boxes of masses m and 2m are in contact with each other on a frictionless sulm r1x*n -kv5 o1eik78ytlu s8rface. (See Fig. 4-3.) What is the acceleration of the more massive box?m8t7v r 1-x1*l k8lek5yosinu

  Two boxes of masses m and 2m are in contact with each orqx7u0 *5ra: ga6nkvxther on a frictionless surface. (See Fig. 4-3.) What is thv nxa 5qru7rg:a*0 xk6e net force on the more massive box?

  Two boxes of masses m and 2m are con y- irr),m0t c7git+qmnected by a rope. (See Fig. 4-4.) If the forward force on t qy0mg,rti-mi)r+t 7che more massive box is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See F j uecq2((el+zig. 4-4.) If the forward force on the more massive box is u eqzj(2ce(l+ F, what is the acceleration of the less massive box?

Two boxes are connected by a cord running over a pulley as shown in Fig. 4-5. B8lfj 3unni7 f:ox Ii:nf 3lunj 87f of mass
8.0 kg rest on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg.
(a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting on each of the masses.
(b) Calculate the acceleration of the system.
(c) Calculate the tension in the cord.

  The coefficient of static and kinetic frictions between a 3.0-kg box and a7.j i )wt ,g 7ylh0.ysyjf,lbk desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force iy0),,h yl.kigywf.jts 7b lj7s applied to the box?

  The coefficients of static and kinetic frictions for plastic on wood are 0.50 airfvn8,o rdul9f 3 6v,nd 0.lvf9 ,u i6rv38r ,ndfo40,
respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?

  An object slides on a levetgr2:h owf s:4)d lc7vl surface in the +x direction. It slows and comes to a stop with a constant lv7o w4gst fr: :)2dchacceleration of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pullrfd 4ct 0h j7ybk083sjed by a 5.0-N force. A 3.0-N frictiodrfy 3h8ks c4b0jt70 jn force retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0:sgwj6plt* f-xg-o 0cqm, ++w 4rny qw N accelerates a 4.0-kg mass, from rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initial speed of 10 m/s. It slides 50c t6tdbz 0xrl wf;)z// m on the ice before it stops. What is the ccrw/tlz f/06z bt;dx)oefficient of kinetic friction between the puck and the ice?

  During the investigation of jdm;*b(e(epot yen y fx9q(f--)pz d*a traffic accident, police find skid marks 90.0 m long. They determine the coefficient of friction between the car's tires and the roadway to be 0.500 for the prevailing conditionsdxt(yby zop**9 -e;jnf) e qpmd f((-e. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The surface ber*cvi7fm/7z2fe : oe2n5ireftween the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does not slide on the more massive box, what is the static friction force on the less massive m fvz/ei r*75f7:eei fn orc22box?

  Two boxes of masses m and 3m are stacked. (See Fig. 4-6.) The9 v* xx-x 5e5)slrllqu surface between the more massive boxl5x-xrvl )l* xs que95 and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box does not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The ple g pxccez-7:6xh1aj9 ane is inclined at an angle 9:1hapg-xexce67cjz of $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hill that makes an angle of q x9n-ef6p18 rfd6l 1h sep,hh$10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclisqxr 1s w; ,pi(h7y3lwned plane with an angle of $37^{\circ}$ to the horizontal. If the inclined plane is 5.0-m long, how long does it take for the mass to reach the bottom of the inclined plane after it is released from rest?

A block lies on a smooth inclined plane tilted at an anglsfcnn: ta g49,e of $35^{\circ}$ to the horizontal.
(a) Draw the free-body diagram for the block.
(b) Determine the block's acceleration as it slides down the inclined plane.
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline.
(d) How long did it take the block to reach the bottom of the inclined plane?

  A wooden block slides directly down *g j(3 r7 tfpoyq*a/hxan inclined plane, at a constant velocity of 6.0 m/sh/agj*tfy7pq*r x( o3 .
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass m slides down a ro 11:nlr7hqus d 0tcme4y2fwq)ugh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slides down a rouge t 8,mebm2- --iexejfh $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. If the plane is 10 m long and the mass starts from rest, what will be its speed at the bottom of the plane?

  A bulldozer drags a log weighing qo.djayf r e4c(4fkk0ipuo:oj+; +.b eqk3r/500 N along a rough surface. The cable attached to the+0pqkf4.qu:r3ok; /f bejro i ja+od.4( ceyk log makes an angle of $30.0^{\circ}$ with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable in order for the log to begin to move?

A 25.0-kg box is released from rest on a roug pz/ldghef5 - r4a fq-qqn5e48h inclined plane tilted at an angleg-fqpen5e/4q-z 5a hfrdq8l 4 of $33.5^{\circ}$ to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200.
(a) Draw the free-body diagram for the box.
(b) Determine the force of kinetic friction acting on the box.
(c) Determine the acceleration of the box as it slides down the inclined plane.

  An object is placed on an inclined plane. The angle w 9 2jyilz,knxntw+r*i 0x :b,of incline is gradually increased until the object begins to slide. The angle at which this occurs is q. What is the coefficient of static friction between the object and n2b ,w:tzxr*0iw9kixjl +yn,the plane?